N.J. Stat. § 54:1-35.28
In the case of an applicant who, on or after effective date of this act but not later than June 30, 1969, while actually in office as an assessor or performing the duties of an assessor, whether in the classified or unclassified service under Title 11, Civil Service, or in a municipality which has not adopted Title 11, Civil Service, shall furnish proof that he has received certificates indicating satisfactory completion on or before June 30, 1969 of training courses heretofore designated as Principles of Municipal Assessing I and Principles of Municipal Assessing II, or such other training courses as are certified as their equivalent by Rutgers, the State University, the director shall issue to such applicant a tax assessor certificate without examination, upon payment of an additional fee of $25.00 to the order of the State Treasurer.
N.J.S. § 54:1-35.28